Westerville sits across Franklin and Delaware counties, both listed as EPA Radon Zone 1 (highest predicted potential). The only way to know your home’s level is to test.

Call (614) 363-6129 to get connected with a licensed Ohio radon professional for testing or mitigation.

Westerville Radon is a free referral service. We are not a licensed radon tester or mitigation contractor.

Why test here

According to the U.S. EPA Map of Radon Zones, Franklin County and Delaware County are Zone 1. That means the predicted average indoor screening level is greater than 4 picocuries per liter (pCi/L). The EPA still says every home should be tested. Zone maps do not replace a test of your own house.

The Ohio Department of Health publishes county radon statistics from licensed professionals (pre-mitigation results, 2010 to present). In a September 24, 2026 export of that dashboard:

• Franklin County: arithmetic mean 6.0 pCi/L; 45.59% of tests above 4 pCi/L
• Delaware County: arithmetic mean 6.0 pCi/L; 49.82% of tests above 4 pCi/L

ODH also states that radon maps are for education only and that testing is the only way to know the level in your home.

Sources: EPA Map of Radon Zones; ODH Radon Data; ODH dashboard export summarized publicly Sept 24, 2026.

How this site works

1. You call (614) 363-6129.
2. We take basic details (city, testing vs mitigation, timing).
3. We connect you with a licensed Ohio radon professional who serves your area.
4. That licensed pro handles scheduling, pricing, testing, or system installation.

You can verify licenses yourself on the Ohio Department of Health Hire a Professional Radon Licensure map.

Services we refer

• Radon testing for homes, including real-estate timelines
• Radon mitigation when levels are at or above the EPA action level
• Post-mitigation retesting after a system is installed

Radon Testing | Radon Mitigation | FAQ

Areas we cover

Westerville, Genoa Township, Lewis Center, Galena, Sunbury, and New Albany. See all Service Areas.

Ready to test or need mitigation help?

Call (614) 363-6129
Free referral. Licensed Ohio professionals. No obligation from this site.